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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Some infants with koilonychia do have iron deficiency, so see your baby's doctor if you notice this nail change. Vitamin B-12 deficiency can cause nail discoloration, including, brownish or blue nails or blue-black streaks not associated with ridges. Brown, black or white bands can also indicate malnutrition.